Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1979-03-29
1980-12-09
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
3151693, 340716, 340765, 340811, H05B 3308
Patent
active
042387930
ABSTRACT:
An electroluminescent (EL) panel for use as a backlight in a passive electrooptical display of the light control type is provided wherein the phosphor bodies in each segment of the panel are excited to luminesce by a low duty cycle pulsed high frequency potential. Power consumption is reduced further by the use of a subdivided EL panel sequentially activated (multiplexed) by the pulsed high frequency potential. The multiplexing frequency is selected to substantially effect a perceived continuous (for as long as needed), evenly distributed source of light coming from all of the segments of the panel. Since the segments are only sequentially excited, the power drain on battery sources of power is greatly reduced without adversely affecting the perceived continuous and evenly distributed level of illumination produced by the panel as a unitary light source.
REFERENCES:
patent: 3388292 (1968-06-01), Burns
patent: 3908150 (1975-09-01), Webb
patent: 3918041 (1975-11-01), Mao
patent: 3992873 (1976-11-01), Awalt
patent: 4070663 (1978-01-01), Kanatani et al.
Timex Corporation
Trafton David L.
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